From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Tue, 1 Jul 2025 12:07:39 +0000 (+0200)
Subject: cxl: make cxl_bus_type constant
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ac0fe6a5731700bcea6fecfd5d0b76c0454b3a20;p=thirdparty%2Flinux.git

cxl: make cxl_bus_type constant

Now that the driver core can properly handle constant struct bus_type,
move the cxl_bus_type variable to be a constant structure as well,
placing it into read-only memory which can not be modified at runtime.

Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Jonathan Cameron <jonathan.cameron@huawei.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Alison Schofield <alison.schofield@intel.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: linux-cxl@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://patch.msgid.link/2025070138-vigorous-negative-eae7@gregkh
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
---

diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c
index eb46c6764d202..0696f7fcef568 100644
--- a/drivers/cxl/core/port.c
+++ b/drivers/cxl/core/port.c
@@ -2293,7 +2293,7 @@ static const struct attribute_group *cxl_bus_attribute_groups[] = {
 	NULL,
 };
 
-struct bus_type cxl_bus_type = {
+const struct bus_type cxl_bus_type = {
 	.name = "cxl",
 	.uevent = cxl_bus_uevent,
 	.match = cxl_bus_match,
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
index 3f1695c96abca..e7b66ca1d4230 100644
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -815,7 +815,7 @@ int cxl_dvsec_rr_decode(struct cxl_dev_state *cxlds,
 
 bool is_cxl_region(struct device *dev);
 
-extern struct bus_type cxl_bus_type;
+extern const struct bus_type cxl_bus_type;
 
 struct cxl_driver {
 	const char *name;